Electromagnetic coupling type slip ring applied to wireless power supply and communication of intelligent drill rod, method thereof and modulation and demodulation system

Abstract

The invention relates to the field of industrial automation and wireless energy transmission, and discloses an electromagnetic coupling type slip ring applied to wireless power supply and communication of an intelligent drill rod, a method of the electromagnetic coupling type slip ring and a modulation and demodulation system. The power transmitting end shell sleeves the power receiving end shell, and balls are arranged between the power transmitting end shell and the power receiving end shell; the opposite sides of the power transmitting end shell and the power receiving end shell are respectively provided with an annular groove; the magnetic core comprises a power transmitting end magnetic core and a power receiving end magnetic core, and is arranged in the corresponding annular groove of the power transmitting end shell and the corresponding annular groove of the power receiving end shell; the magnetic cores are arranged in the annular groove to form a U-shaped magnetic core groove; the coil comprises a power transmitting end coil and a power receiving end coil which are respectively arranged in the corresponding U-shaped magnetic core grooves; the coil and the magnetic core are sealed and fixed in the respective annular grooves through a pouring sealant, and the surface of the pouring sealant, the lower surface of the power transmitting end shell and the upper surface of the power receiving end shell are located on the same horizontal plane.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial automation and wireless energy transmission, and in particular to an electromagnetic coupling slip ring applied to wireless power supply and communication of an intelligent drill pipe, a method thereof, and a modulation and demodulation system. Background Art

[0002] In the field of modern industrial automation, smart drill pipes are widely used in deep well drilling, oil and gas extraction and other processes. However, traditional power supply and communication methods face many challenges, mainly including the following: Wired power supply: Wired power supply has the problem of wire entanglement, cannot be used directly, and is easily damaged in deep well environments.

[0003] Built-in battery power supply: The built-in battery has limited power and must be replaced regularly. In some cases where battery replacement is not allowed, this power supply method will affect the continuity of operation.

[0004] Brush slip ring power supply: Brush slip rings wear quickly, resulting in unstable energy transmission and requiring regular maintenance, which increases operating costs. In addition, explosion-proof electric slip rings have a complex structure and a large size, and are prone to structural interference when installed on smart drill pipes.

[0005] Rotary transformer power supply: The installation process of the rotary transformer is demanding and is easily affected by environmental factors such as temperature changes, which can lead to unstable power supply.

[0006] In summary, traditional power supply and data transmission methods not only limit the flexibility of drill pipes, but may also lead to problems such as unstable power supply, cable wear, and signal interference, seriously affecting operational efficiency and safety. Summary of the invention

[0007] In view of the above problems, the purpose of the present invention is to provide an electromagnetic coupling slip ring and its method and modulation and demodulation system for wireless power supply and communication of intelligent drill pipe. The slip ring design based on electromagnetic coupling technology can realize efficient wireless power supply and two-way wireless communication of intelligent drill pipe, overcome the shortcomings of the prior art, and improve the stability and reliability of the system.

[0008] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an electromagnetic coupling slip ring applied to wireless power supply and communication of an intelligent drill pipe, comprising: a shell, comprising a power transmission end shell and a power receiving end shell, which is arranged on the intelligent drill pipe; the inner side end of the power transmission end shell is sleeved above the inner side end of the power receiving end shell, and a ball is arranged between the two, and a bearing-like connection is formed by the ball; the outer side end of the power transmission end shell is arranged corresponding to the outer side end of the power receiving end shell, and annular grooves are respectively arranged on the opposite sides of the two; a magnetic core, comprising a power transmission end magnetic core and a power receiving end magnetic core, is respectively arranged in the annular groove of the corresponding power transmission end shell, and in the annular groove of the corresponding power receiving end shell; the magnetic cores are arranged in the annular groove to form a U-shaped magnetic core groove; a coil, comprising a power transmission end coil and a power receiving end coil, is respectively arranged in the corresponding U-shaped magnetic core groove, and the U-shaped magnetic core groove is filled; the coil and the magnetic core are sealed and fixed in their respective annular grooves by potting glue, and the surface of the potting glue is respectively located at the same horizontal plane as the lower surface of the power transmission end shell and the upper surface of the power receiving end shell.

[0009] Furthermore, both the power transmission end housing and the power receiving end housing adopt an annular structure; a stator fixing end is provided at the outer end of the power transmission end housing.

[0010] Furthermore, the housing of the power receiving end is sleeved on the intelligent drill rod and fixed with an anti-loosening top screw.

[0011] Furthermore, the magnetic core is formed by arranging and splicing a plurality of U-shaped magnetic cores, and each U-shaped magnetic core is spliced ​​by a plurality of ferrite magnets, and the ferrite magnets have a rectangular parallelepiped structure.

[0012] Furthermore, adjacent ferrite magnets are fixed with quick-drying glue; adjacent U-shaped magnetic cores are also fixed with quick-drying glue.

[0013] Furthermore, there is a gap between the inner end of the power transmission end housing and the inner end of the power reception end housing, so that there is a distance between the magnetic cores arranged in the outer ends of the two.

[0014] Furthermore, wire holes are provided on both the power transmission end housing and the power receiving end housing, so that the lead cables of the power transmission end coil and the power receiving end coil pass through the corresponding wire holes respectively, and the lead cables are sealed and fixed to the corresponding housings through glands respectively.

[0015] Furthermore, the lead-out cable of the power transmitting end coil is connected to the power supply / communication circuit board via the power transmitting end power supply / communication line, and the lead-out cable of the power receiving end coil is inserted into the intelligent drill pipe protection short section via the power receiving end power supply / communication line and connected to the power supply / communication main circuit.

[0016] A method for installing an electromagnetic coupling slip ring for wireless power supply and communication of an intelligent drill pipe, which is used to install the electromagnetic coupling slip ring for wireless power supply and communication of an intelligent drill pipe in the above-mentioned embodiments, and comprises: Clean the shell surface; Fix the power transmission end housing or the power receiving end housing on the installation platform and keep it level; Splice multiple pieces of ferrite magnets into a U-shaped core and fix them with quick-drying glue; Arrange several U-shaped magnetic cores evenly in the annular groove of the power transmission end housing and fix them with quick-drying glue; Strip the outer sheath of the double-core cable and spirally wind it around the bottom of the U-shaped magnetic core slot. After reaching the set number of turns, pass the cable through the threading hole of the power transmission end shell or the power receiving end shell, and use explosion-proof gland 11 to seal it on the shell; Pour the epoxy resin evenly over the magnet and coil, making sure the liquid level is level with the upper surface of the shell; let it stand to ensure that the potting glue is completely cured; Put the receiving end housing on the outside of the smart drill rod and fix it with anti-loosening screws to ensure that it is relatively stationary and rotates synchronously with the drill rod; The power transmission end housing is sleeved on the power receiving end housing, and the two are connected in a bearing-like form through stainless steel balls, and the outer surface of the balls is coated with solid lubricant; the distance between the power transmission end and the power receiving end is about 2mm to ensure that the core gap is about 3mm; Connect the hinge or cable to the stator fixed end of the power transmission end; Connect the lead-out cable of the power transmission end to the power supply / communication circuit board, insert the lead-out cable of the power receiving end into the intelligent drill pipe protection short section, and connect it to the power supply / communication main circuit.

[0017] A modulation and demodulation system of an electromagnetic coupling slip ring applied to wireless power supply and communication of an intelligent drill pipe is implemented based on the electromagnetic coupling slip ring applied to wireless power supply and communication of an intelligent drill pipe in the above-mentioned embodiments for installing, and comprises: a power transmission end circuit and a power receiving end circuit; The high-frequency inverter circuit of the power transmission end circuit converts the DC power provided by the DC power supply into high-frequency AC power and transmits it to the resonant compensation circuit; The 2FSK modulation circuit loads the downlink signal sent by the data processing center into high-frequency AC power and transmits it to the resonant compensation circuit; The resonant compensation circuit will stably output the electromagnetic induction driving signal, and the electromagnetic induction energy and signal will be wirelessly transmitted to the receiving end coil via the transmitting end coil; The electromagnetic induction energy and signal are transmitted to the rectifier circuit via the resonant compensation circuit in the receiving end circuit, and the rectifier circuit converts the electromagnetic induction energy and signal into a DC signal to supply power to the intelligent drill pipe load and the modulation and demodulation circuit in the receiving end circuit; The electromagnetic induction energy passes through the isolation circuit, bandpass filter, demodulation amplifier circuit and detection circuit in sequence, and then outputs an uplink signal to the MCU at the receiving end; The sensing data at the receiving end is packaged to form an uplink signal, which passes through the 2FSK modulation circuit and the resonance compensation circuit in sequence. The resonance compensation circuit outputs a reverse driving electromagnetic induction signal, which is wirelessly transmitted to the transmitting end coil through the receiving end coil; at the same time, it is returned to the transmitting end MCU through the same detection process as the transmitting end circuit, and is sent to the data processing center by wire.

[0018] The present invention adopts the above technical solution, which has the following advantages: 1. The explosion-proof structure of the electromagnetic coupling slip ring of the present invention adopts electromagnetic coupling technology to design the slip ring structure. The designed slip ring is small in size, and the flat structure will not interfere with the drill rod. It is easy to install and suitable for the application scenario of the intelligent drill rod. The U-shaped magnetic steel is used to assemble the annular magnetic core to avoid the problems of the overall magnetic core being difficult to process and easy to break. The annular magnetic core is combined with a planar spiral coil to achieve high-efficiency wireless energy transmission and two-way data communication when the coupling distance is about 3mm. The core and coil are encapsulated with epoxy resin to meet the explosion-proof certification requirements.

[0019] 2. The electromagnetic coupling slip ring modulation and demodulation system of the present invention adopts 2FSK frequency modulation technology based on energy signals, modulates communication data into energy signals at the transmitting end (power transmitting end) of the electromagnetic coupling slip ring, and wirelessly sends energy and data to the receiving end (power receiving end) through electromagnetic induction. The receiving end then separates energy and data through 2FSK demodulation technology, and the energy is used to power the receiving end, including the receiving end circuit board and load (sensor, etc.); the data is used to complete the control and detection of the sensor terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a partial cross-sectional view of the electromagnetic coupling slip ring structure in an embodiment of the present invention; Figure 2 In the embodiment of the present invention Figure 1 A magnified cross-section of the slip ring structure at center A; Figure 3 is a slip ring assembly flow chart in an embodiment of the present invention; Figure 4 is a structural diagram of an electrically coupled slip ring modulation and demodulation system in an embodiment of the present invention; Reference numerals: 1-transmitting end housing; 2-receiving end housing; 3-intelligent drill rod; 4-ball bearing; 5-transmitting end magnetic core; 6-receiving end magnetic core; 7-transmitting end coil; 8-receiving end coil; 9-potting glue; 10-stator fixed end; 11-gland; 12-transmitting end power supply / communication cable; 13-receiving end power supply / communication cable. DETAILED DESCRIPTION

[0021] With the continuous development of industrial automation technology, higher requirements are placed on the power supply and communication systems of smart drill pipes. Developing a solution that can achieve wireless energy transmission and two-way wireless communication is of great significance to improving the performance and reliability of smart drill pipes.

[0022] With the gradual rise of wireless charging of portable devices, electromagnetic induction wireless power transmission technology has received widespread attention. The working principle of this technology is similar to that of a transformer. By increasing the frequency, high-power and high-efficiency energy transmission can be achieved. However, this technology is only suitable for short-distance transmission (usually within a few centimeters), and its transmission efficiency will drop sharply as the distance between the transmitting coil and the receiving coil increases, and precise position alignment is required. However, considering that the electromagnetic coupling device can be designed in a circular shape and installed on the outside of the smart drill pipe, the precise alignment of the transmitting coil and the receiving coil of the electromagnetic coupling device can be guaranteed under the structural constraints of the drill pipe. In addition, the energy and signal transmission of the smart drill pipe mainly pursues wireless functions, and the distance between the transmitting coil and the receiving coil is not high. In summary, the non-contact slip ring developed based on the principle of electromagnetic induction is very suitable for the application scenarios of smart drill pipes.

[0023] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0024] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0025] Embodiment 1: In this embodiment of the present invention, an electromagnetic coupling slip ring for wireless power supply and communication of intelligent drill pipe is provided, which is suitable for the wireless power supply and communication system of intelligent drill pipe. In this embodiment, it includes a transmitting coil and a receiving coil, and adopts a ring-shaped magnetic core structure to achieve efficient electromagnetic coupling. Specifically, as Figures 1 to 3 As shown, the electromagnetic coupling slip ring comprises: The housing includes a power transmission end housing 1 and a power receiving end housing 2, and is arranged on the intelligent drill rod 3; The inner end of the power transmission end housing 1 is sleeved on the inner end of the power receiving end housing 2, and a ball 4 is arranged between the two, forming a bearing-like connection through the ball 4; The outer side of the power transmission end housing 1 is arranged correspondingly to the outer side of the power receiving end housing 2, and an annular groove is arranged on the opposite sides of the two. The magnetic cores, including a power-transmitting-end magnetic core 5 and a power-receiving-end magnetic core 6, are respectively arranged in the annular groove of the corresponding power-transmitting-end housing 1 and the annular groove of the corresponding power-receiving-end housing 2; the magnetic cores are arranged in the annular grooves to form a U-shaped magnetic core groove; The coils, including the power transmission end coil 7 and the power receiving end coil 8, are respectively arranged in the corresponding U-shaped magnetic core grooves to fill the U-shaped magnetic core grooves; The coil and the magnetic core are sealed and fixed in their respective annular grooves by potting glue 9, and the surface of the potting glue 9 is respectively located at the same level as the lower surface of the power transmission end housing 1 and the upper surface of the power receiving end housing 2. The potting glue 9 is epoxy resin potting glue.

[0026] In the above embodiment, both the power transmission end housing 1 and the power receiving end housing 2 are annular structures. A stator fixing end 10 is provided at the outer end of the power transmission end housing 1.

[0027] In the above embodiment, the power receiving end housing 2 is sleeved on the intelligent drill rod 3 and fixed with an anti-loosening screw to ensure that it is relatively stationary and rotates synchronously with the drill rod.

[0028] In the above embodiment, the magnetic core is composed of several U-shaped magnetic cores arranged and spliced, and each U-shaped magnetic core is spliced ​​by multiple ferrite magnets, and the ferrite magnets are rectangular. Adjacent ferrite magnets are fixed with quick-drying glue; adjacent U-shaped magnetic cores are also fixed with quick-drying glue.

[0029] In the above embodiment, there is a gap between the inner end of the power transmission end housing 1 and the inner end of the power reception end housing 2 to ensure that there is a spacing between the magnetic cores disposed in the outer ends of the two.

[0030] Optionally, in this embodiment, the gap between the inner end of the power transmission end housing 1 and the inner end of the power receiving end housing 2 is 2 mm, so as to ensure that the spacing between the two magnetic cores is 3 mm.

[0031] In the above embodiment, wire holes are provided on both the power transmission end housing 1 and the power receiving end housing 2, so that the lead-out cables of the power transmission end coil 7 and the power receiving end coil 8 pass through the corresponding wire holes respectively, and the lead-out cables are sealed and fixed to the corresponding housings through the glands 11. Among them, the lead-out cable of the power transmission end coil 7 is connected to the power supply / communication circuit board through the power transmission end power supply / communication cable 12, and the lead-out cable of the power receiving end coil 8 is inserted into the protection short section of the intelligent drill pipe 3 through the power receiving end power supply / communication cable 13, and connected to the power supply / communication main circuit.

[0032] In this embodiment, gland 11 adopts explosion-proof gland.

[0033] Embodiment 2: In this embodiment of the present invention, a method for installing an electromagnetic coupling slip ring for wireless power supply and communication of an intelligent drill pipe is provided, which is used to install the electromagnetic coupling slip ring for wireless power supply and communication of an intelligent drill pipe in the above embodiments.

[0034] In this embodiment, considering that the shell of the slip ring is annular, if an integrated annular magnetic core is used, the processing difficulty and cost will be greatly increased. Therefore, a rectangular magnetic core is used to assemble into a U-shaped magnetic core structure.

[0035] The design of the transmitting coil and the receiving coil needs to consider the number of turns, diameter and material of the coil to ensure the best coupling effect.

[0036] Optimization of the width and depth of the U-shaped core slot: The width and depth of the core slot are optimized through COMSOL simulation software to ensure the maximization of the coupling coefficient.

[0037] According to the optimization process of COMSOL simulation software, the core slot width of the U-shaped core structure was finally determined to be 11mm. Considering the wiring height and glue filling space, as well as the explosion-proof requirements, the slot depth was determined to be 5mm. In addition, considering factors such as the vibration of the rotating mechanism and assembly errors, the gap between the power transmission end and the power receiving end was set to 3mm. The electromagnetic coupling slip ring is composed of a magnetic core (ferrite), a power transmission end housing (stainless steel 304) 2, a power receiving end housing (stainless steel 304) 5, a double-core cable, a gland, a ball 9, an epoxy resin potting glue 8, loose screws and other components. The installation steps of the slip ring are as follows: Figure 3 shown.

[0038] In this embodiment, Figure 3 As shown, the installation method includes the following steps: 1) Clean the power transmission end housing 1 or the power receiving end housing 2 to thoroughly clean the burrs on the surface of the power transmission end housing 1 and the power receiving end housing 2, and blow away the debris and dust on the surface.

[0039] 2) Fix the power transmission end housing 1 or the power receiving end housing 2 on the installation platform and keep it level to reduce the stress generated when the potting glue solidifies 8.

[0040] 3) Splice multiple ferrite magnets into a U-shaped magnetic core and fix them with quick-drying glue; in this embodiment, preferably 7 ferrite magnets are spliced ​​into a U-shaped magnetic core.

[0041] 4) Arrange several U-shaped magnetic cores evenly in the annular groove of the power transmission end housing and fix them with quick-drying glue; in this embodiment, 60 U-shaped magnetic cores are preferred.

[0042] 5) Peel off the outer sheath of the double-core cable and wind it spirally around the bottom of the U-shaped magnetic core slot. After reaching the set number of turns, pass the cable through the threading hole of the power transmission end housing 1 or the power receiving end housing 2, and use explosion-proof gland 11 to seal and fix it on the housing.

[0043] 6) Pour epoxy resin evenly over the magnet and coil, making sure the liquid level is level with the upper surface of the shell. Leave it for 12 hours to ensure that the potting glue is completely cured.

[0044] 7) Sleeve the power receiving end housing 2 onto the outside of the smart drill pipe 3 (lower edge of the lower blowout preventer) and fix it with a locking screw to ensure that it is relatively stationary and rotates synchronously with the drill pipe.

[0045] 8) The power transmission end housing 1 is sleeved on the power receiving end housing 2, and the two are connected in a bearing-like manner through a stainless steel ball 9. The ball 9 is coated with solid lubricant to reduce sliding friction. The distance between the power transmission end and the power receiving end is about 2mm to ensure that the core gap is about 3mm.

[0046] 9) Connect the hinge or cable to the stator fixed end 10 at the power transmission end to ensure that the slip ring stator does not rotate with the rotor (power receiving end).

[0047] 10) Connect the lead-out cable of the power transmission end to the power supply / communication circuit board, insert the lead-out cable of the power receiving end into the intelligent drill pipe protection short section, and connect it to the power supply / communication main circuit.

[0048] Embodiment 3: In this embodiment of the present invention, a modulation and demodulation system of an electromagnetic coupling slip ring applied to wireless power supply and communication of an intelligent drill pipe is provided, which is based on the electromagnetic coupling slip ring applied to wireless power supply and communication of an intelligent drill pipe in the above embodiments. In this embodiment, a 2FSK frequency modulation technology based on an energy signal is adopted to avoid the power reduction and poor anti-interference performance caused by other modulation methods. Figure 4 As shown, the modulation and demodulation system includes: a power transmission end circuit and a power receiving end circuit. The power transmission end circuit includes a high-frequency inverter circuit, a resonance compensation circuit, a 2FSK modulation circuit, an isolation circuit, a bandpass filter, a demodulation amplifier circuit and a detection circuit; the power receiving end circuit includes a 2FSK modulation circuit, a resonance compensation circuit, a rectification circuit, an isolation circuit, a bandpass filter, a demodulation amplifier circuit and a detection circuit.

[0049] Specifically, the high-frequency inverter circuit converts the DC power provided by the DC power supply into high-frequency AC power and transmits it to the resonant compensation circuit; The 2FSK modulation circuit loads the downlink signal sent by the data processing center into high-frequency AC power and transmits it to the resonant compensation circuit; The resonance compensation circuit will stably output the electromagnetic induction driving signal, and the electromagnetic induction energy and signal will be wirelessly transmitted to the receiving end coil 8 via the power transmission end coil 7; The electromagnetic induction energy and signal are transmitted to the rectifier circuit via the resonant compensation circuit in the receiving end circuit, and the rectifier circuit converts the electromagnetic induction energy and signal into a DC signal to supply power to the intelligent drill pipe load and the modulation and demodulation circuit in the receiving end circuit; The electromagnetic induction energy passes through the isolation circuit, bandpass filter, demodulation amplifier circuit and detection circuit in sequence, and outputs a digital signal as an uplink signal, which is transmitted to the MCU at the receiving end to perform sensor data acquisition operations or other control actions.

[0050] The sensing data at the receiving end is packaged to form an uplink signal, which passes through the 2FSK modulation circuit and the resonance compensation circuit in sequence. The resonance compensation circuit outputs a reverse driving electromagnetic induction signal, which is wirelessly transmitted to the transmitting end coil 7 via the receiving end coil 8; at the same time, it is returned to the transmitting end MCU through the same detection process as the transmitting end circuit, and finally sent to the data processing center via wired means.

[0051] The detection process is the same as that of the power transmission end circuit, that is, the reverse driving electromagnetic induction signal passes through the isolation circuit, the bandpass filter, the demodulation amplifier circuit and the detection circuit in sequence.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electromagnetic coupling slip ring used for wireless power supply and communication of intelligent drill pipe, characterized in that: include: The housing, including a power transmission end housing and a power receiving end housing, is arranged on the intelligent drill rod; The inner end of the power transmission end housing is sleeved on the inner end of the power receiving end housing, and a ball is arranged between the two, forming a bearing-like connection through the ball; The outer side end of the power transmission end housing is arranged correspondingly to the outer side end of the power receiving end housing, and an annular groove is arranged on the opposite sides of the two housings respectively; The magnetic core includes a power-transmitting end magnetic core and a power-receiving end magnetic core, which are respectively arranged in the corresponding annular groove of the power-transmitting end shell and the corresponding annular groove of the power-receiving end shell; the magnetic cores are arranged in the annular grooves to form a U-shaped magnetic core groove; The coils, including the power transmission end coil and the power receiving end coil, are respectively arranged in the corresponding U-shaped magnetic core grooves, and the U-shaped magnetic core grooves are filled; The coil and the magnetic core are sealed and fixed in their respective annular grooves by potting glue, and the surface of the potting glue is respectively located at the same horizontal plane as the lower surface of the power transmission end shell and the upper surface of the power receiving end shell.

2. The electromagnetic coupling slip ring for wireless power supply and communication of intelligent drill pipe according to claim 1, characterized in that: The power transmission end shell and the power receiving end shell both adopt an annular structure; the stator fixing end is arranged at the outer end of the power transmission end shell.

3. The electromagnetic coupling slip ring for wireless power supply and communication of intelligent drill pipe according to claim 1, characterized in that: The power receiving end housing is sleeved on the intelligent drill rod and fixed with an anti-loosening top screw.

4. The electromagnetic coupling slip ring for wireless power supply and communication of intelligent drill pipe according to claim 1, characterized in that: The magnetic core is formed by arranging and splicing a plurality of U-shaped magnetic cores, and each U-shaped magnetic core is spliced ​​by a plurality of ferrite magnets, and the ferrite magnets adopt a rectangular parallelepiped structure.

5. The electromagnetic coupling slip ring for wireless power supply and communication of intelligent drill pipe as claimed in claim 4, characterized in that: Adjacent ferrite magnets are fixed with quick-drying glue; adjacent U-shaped magnetic cores are also fixed with quick-drying glue.

6. The electromagnetic coupling slip ring for wireless power supply and communication of intelligent drill pipe according to claim 1, characterized in that: There is a gap between the inner end of the power transmission end housing and the inner end of the power reception end housing, so that there is a distance between the magnetic cores arranged in the outer ends of the two.

7. The electromagnetic coupling slip ring for wireless power supply and communication of intelligent drill pipe according to claim 1, characterized in that: Both the power transmission end housing and the power receiving end housing are provided with wire holes, so that the lead cables of the power transmission end coil and the power receiving end coil pass through the corresponding wire holes respectively, and the lead cables are sealed and fixed to the corresponding housings through glands respectively.

8. The electromagnetic coupling slip ring for wireless power supply and communication of intelligent drill pipe as claimed in claim 7, characterized in that: The lead-out cable of the coil at the power transmitting end is connected to the power supply / communication circuit board via the power supply / communication line at the power transmitting end, and the lead-out cable of the coil at the power receiving end is inserted into the intelligent drill pipe protection short section via the power supply / communication line at the power receiving end and connected to the power supply / communication main circuit.

9. A method for installing an electromagnetic coupling slip ring for wireless power supply and communication of an intelligent drill pipe, which is used to install the electromagnetic coupling slip ring for wireless power supply and communication of an intelligent drill pipe according to any one of claims 1 to 8, characterized in that: include: Clean the shell surface; Fix the power transmission end housing or the power receiving end housing on the installation platform and keep it level; Splice multiple pieces of ferrite magnets into a U-shaped core and fix them with quick-drying glue; Arrange several U-shaped magnetic cores evenly in the annular groove of the power transmission end housing and fix them with quick-drying glue; Strip the outer sheath of the double-core cable and spirally wind it around the bottom of the U-shaped magnetic core slot. After reaching the set number of turns, pass the cable through the threading hole of the power transmission end shell or the power receiving end shell, and use explosion-proof gland 11 to seal it on the shell; Pour the epoxy resin evenly over the magnet and coil, making sure the liquid level is level with the upper surface of the shell; let it stand to ensure that the potting glue is completely cured; Put the receiving end housing on the outside of the smart drill rod and fix it with anti-loosening screws to ensure that it is relatively stationary and rotates synchronously with the drill rod; The power transmission end housing is sleeved on the power receiving end housing, and the two are connected in a bearing-like form through stainless steel balls, and the outer surface of the balls is coated with solid lubricant; the distance between the power transmission end and the power receiving end is about 2mm to ensure that the core gap is about 3mm; Connect the hinge or cable to the stator fixed end of the power transmission end; Connect the lead-out cable of the power transmission end to the power supply / communication circuit board, insert the lead-out cable of the power receiving end into the intelligent drill pipe protection short section, and connect it to the power supply / communication main circuit.

10. A modulation and demodulation system of an electromagnetic coupling slip ring for wireless power supply and communication of an intelligent drill pipe, based on the electromagnetic coupling slip ring for wireless power supply and communication of an intelligent drill pipe according to any one of claims 1 to 8, characterized in that: include: A power transmission end circuit and a power receiving end circuit; The high-frequency inverter circuit of the power transmission end circuit converts the DC power provided by the DC power supply into high-frequency AC power and transmits it to the resonant compensation circuit; The 2FSK modulation circuit loads the downlink signal sent by the data processing center into high-frequency AC power and transmits it to the resonant compensation circuit; The resonant compensation circuit will stably output the electromagnetic induction driving signal, and the electromagnetic induction energy and signal will be wirelessly transmitted to the receiving end coil via the transmitting end coil; The electromagnetic induction energy and signal are transmitted to the rectifier circuit via the resonant compensation circuit in the receiving end circuit, and the rectifier circuit converts the electromagnetic induction energy and signal into a DC signal to supply power to the intelligent drill pipe load and the modulation and demodulation circuit in the receiving end circuit; The electromagnetic induction energy passes through the isolation circuit, bandpass filter, demodulation amplifier circuit and detection circuit in sequence, and then outputs an uplink signal to the MCU at the receiving end; The sensing data at the receiving end is packaged to form an uplink signal, which passes through the 2FSK modulation circuit and the resonance compensation circuit in sequence. The resonance compensation circuit outputs a reverse driving electromagnetic induction signal, which is wirelessly transmitted to the transmitting end coil through the receiving end coil; at the same time, it is returned to the transmitting end MCU through the same detection process as the transmitting end circuit, and is sent to the data processing center by wire.

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